AP®︎ Environmental Science: Topic 3.3 Flashcards

Master key terms and definitions for Topic 3.3 of AP Environmental Science – Survivorship Curves to help you prep for quizzes and the AP exam.

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Term

Survivorship Curve

Definition

A graph showing the proportion of an original same-age cohort still alive at each age, from birth to the maximum age reached

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Survivorship Curve
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A graph showing the proportion of an original same-age cohort still alive at each age, from birth to the maximum age reached

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Cohort
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A group of individuals of the same age, usually born or hatched during the same period, that is followed through its life span

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Relative Survivorship (l_x)
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The fraction of the original cohort alive at age x: l_x = n_x/n_0; multiply by 100 to express it as a percentage

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Type I Survivorship Curve
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High survival through early and middle life followed by steep late-life mortality; typical of K-selected species with few offspring and high parental investment

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Type II Survivorship Curve
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A roughly age-independent risk of death, shown as an approximately straight decline on a logarithmic survivorship axis; it can occur in K-selected species

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Type III Survivorship Curve
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Very high early-life mortality followed by greater survival among the few remaining individuals; typical of r-selected species with many offspring and little parental care

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